The ray of light peeking through the crack creates a blinding effect on the subject. The light is so bright that it blinds her vision, covering her eyes in the photo. The black and white filter makes the ray of light even more bright.
there are other people out there - singing the same melodies of wanderlust, climbing over mountains in the dark, and waking in the night to stare at the moon, thinking of this large world and dreaming - just like you." I Apex Curve
The method of double exposure in many pictures like this gives off a whole different story than it originally intended to. Stories telling about things like this often show a certain mood or an amazing beauty just with such a great contrast.